下载地址【1】FireFox浏览器历史版本下载https://ftp.mozilla.org/pub/firefox/releases/
【2】geckodriver驱动下载https://github.com/mozilla/geckodriver/releases【3】chromedriver驱动下载http://chromedriver.storage.googleapis.com/index.html【4】ie浏览器driver驱动下载
http://selenium-release.storage.googleapis.com/index.html